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Publications (10 of 73) Show all publications
Pang, X., Hu, W., Jacobsen, G., Popov, S., Chen, J., Ozolins, O., . . . Xiao, S. (2020). 200 Gbps & x002F;Lane IM & x002F;DD Technologies for Short Reach Optical Interconnects. Paper presented at Optical Fiber Communications Conference and Exhibition (OFC), MAR 03-07, 2019, San Diego, CA, USA. Journal of Lightwave Technology, 38(2), 492-503, Article ID 8943295.
Open this publication in new window or tab >>200 Gbps & x002F;Lane IM & x002F;DD Technologies for Short Reach Optical Interconnects
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2020 (English)In: Journal of Lightwave Technology, ISSN 0733-8724, E-ISSN 1558-2213, Vol. 38, no 2, p. 492-503, article id 8943295Article in journal (Refereed) Published
Abstract [en]

Client-side optics are facing an ever-increasing upgrading pace, driven by upcoming 5G related services and datacenter applications. The demand for a single lane data rate is soon approaching 200 Gbps. To meet such high-speed requirement, all segments of traditional intensity modulation direct detection (IM & x002F;DD) technologies are being challenged. The characteristics of electrical and optoelectronic components and the performance of modulation, coding, and digital signal processing (DSP) techniques are being stretched to their limits. In this context, we witnessed technological breakthroughs in several aspects, including development of broadband devices, novel modulation formats and coding, and high-performance DSP algorithms for the past few years. A great momentum has been accumulated to overcome the aforementioned challenges. In this article, we focus on IM & x002F;DD transmissions, and provide an overview of recent research and development efforts on key enabling technologies for 200 Gbps per lane and beyond. Our recent demonstrations of 200 Gbps short-reach transmissions with 4-level pulse amplitude modulation (PAM) and discrete multitone signals are also presented as examples to show the system requirements in terms of device characteristics and DSP performance. Apart from digital coherent technologies and advanced direct detection systems, such as Stokes-vector and Kramers-Kronig schemes, we expect high-speed IM & x002F;DD systems will remain advantageous in terms of system cost, power consumption, and footprint for short reach applications in the short- to mid- term perspective.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2020
Keywords
Digital signal processing, intensity modulation direct detection, optical fiber communication, optical interconnections
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-268785 (URN)10.1109/JLT.2019.2962322 (DOI)000510911600038 ()2-s2.0-85077280601 (Scopus ID)
Conference
Optical Fiber Communications Conference and Exhibition (OFC), MAR 03-07, 2019, San Diego, CA, USA
Note

QC 20200225

Available from: 2020-02-25 Created: 2020-02-25 Last updated: 2020-02-25Bibliographically approved
Estaran, J. M., Mardoyan, H., Jorge, F., Ozolins, O., Udalcovs, A., Konczykowska, A., . . . Bigo, S. (2019). 140/180/204-Gbaud OOK Transceiver for Inter- and Intra-Data Center Connectivity. Paper presented at Optical Fiber Communications Conference and Exposition (OFC), MAR 11-15, 2018, San Diego, CA. Journal of Lightwave Technology, 37(1), 178-187
Open this publication in new window or tab >>140/180/204-Gbaud OOK Transceiver for Inter- and Intra-Data Center Connectivity
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2019 (English)In: Journal of Lightwave Technology, ISSN 0733-8724, E-ISSN 1558-2213, Vol. 37, no 1, p. 178-187Article in journal (Refereed) Published
Abstract [en]

We report on an ON OFF keying intensity-modulation and direct-detection C-band optical transceiver capable of addressing all datacenter interconnect environments at well beyond 100 Gbaud. For this, the transmitter makes the use of two key InP technologies: a 2:1 double heterojunction bipolar transistor selector multiplexer and a monolithically integrated distributed feedback laser traveling-wave electro-absorption modulator, both exceeding 100-GHz of 3-dB analog bandwidth. A preamplified 110-Gaz PIN photodiode prior to a 100-CHs analog-to-digital converter complete the ultrahigh bandwidth transceiver module; the device under study. In the experimental work, which discriminates between intra- and inter-data center scenarios (dispersion unmanaged 120, 560, and 960 m; and dispersion-managed 10 and 80 km of standard single-mode fiber), we evaluate the bit-error rate evolution against the received optical power at 140, 180, and 204 Gbaud ON OFF keying for different equalization configurations (adaptive linear filter with and without the help of short-memory sequence estimation) and forward error correction schemes (hard-decision codes with 7% and 20% overhead); drawing conclusions from the observed system-level limitations of the respective environments at this ultrahigh baudrate, as well as from the operation margins and sensitivity metrics. From the demonstration, we highlight three results: successful operation with >6-dB sensitivity margin below the 7% error-correction at 140 Gbaud over the entire 100 m-80 km range with only linear feed-forward equalization. Then, the transmission of a 180-Gbaud ON OFF keying carrier over 80 km considering 20% error-correction overhead. Finally, a 10-km communication at 204 (Maud ON OFF keying with up to 6 dB sensitivity margin, and regular 7% overhead error-correction.

Place, publisher, year, edition, pages
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 2019
Keywords
Data center interconnects, electro-absorption modulation, InP, integrated circuits, optical fiber communication, very high-speed modulation
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-244554 (URN)10.1109/JLT.2018.2876732 (DOI)000457605700020 ()2-s2.0-85055147623 (Scopus ID)
Conference
Optical Fiber Communications Conference and Exposition (OFC), MAR 11-15, 2018, San Diego, CA
Note

QC 20190222

Available from: 2019-02-22 Created: 2019-02-22 Last updated: 2019-02-22Bibliographically approved
Ozolins, O., Udalcovs, A., Pang, X., Lin, R., Djupsjöbacka, A., Mårtensson, J., . . . Jacobsen, G. (2018). 112 Gbps/λ PAM4 inter-DCI with continuous-fiber Bragg grating based dispersion compensators. In: Optics InfoBase Conference Papers: . Paper presented at Photonic Networks and Devices, Networks 2018, 2 July 2018 through 5 July 2018. OSA - The Optical Society
Open this publication in new window or tab >>112 Gbps/λ PAM4 inter-DCI with continuous-fiber Bragg grating based dispersion compensators
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2018 (English)In: Optics InfoBase Conference Papers, OSA - The Optical Society , 2018Conference paper, Published paper (Refereed)
Abstract [en]

We demonstrate 56 Gbaud/λ PAM4 inter - data center interconnects over 81 km single core single mode fiber and 33.6 km 7-core single mode fiber with continuous-fiber Bragg grating based chromatic dispersion compensators covering C-band.

Place, publisher, year, edition, pages
OSA - The Optical Society, 2018
Keywords
Chromatic dispersion, Fiber Bragg gratings, Fibers, Photonic devices, Photonics, Pulse amplitude modulation, C-bands, Chromatic dispersion compensators, Continuous fibers, Data centers, Dispersion compensator, Single mode fibers
National Category
Other Physics Topics
Identifiers
urn:nbn:se:kth:diva-236422 (URN)10.1364/NETWORKS.2018.NeTh3F.3 (DOI)2-s2.0-85051272180 (Scopus ID)9781557528209 (ISBN)
Conference
Photonic Networks and Devices, Networks 2018, 2 July 2018 through 5 July 2018
Note

QC 20181025

Available from: 2018-10-26 Created: 2018-10-26 Last updated: 2018-10-26Bibliographically approved
Zhang, L., Pang, X., Ozolins, O., Udalcovs, A., Schatz, R., Westergren, U., . . . Chen, J. (2018). 15-Gbaud PAM4 Digital Mobile Fronthaul with Enhanced Differential Pulse Coding Modulation Supporting 122 LTE-A Channels with up to 4096QAM. In: 2017 European Conference on Optical Communication (ECOC): . Paper presented at 43rd European Conference on Optical Communication, ECOC 2017, Gothenburg, Sweden, 17 September 2017 through 21 September 2017 (pp. 1-3). Institute of Electrical and Electronics Engineers (IEEE)
Open this publication in new window or tab >>15-Gbaud PAM4 Digital Mobile Fronthaul with Enhanced Differential Pulse Coding Modulation Supporting 122 LTE-A Channels with up to 4096QAM
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2018 (English)In: 2017 European Conference on Optical Communication (ECOC), Institute of Electrical and Electronics Engineers (IEEE), 2018, p. 1-3Conference paper, Published paper (Refereed)
Abstract [en]

By employing enhanced DPCM, 15-Gbaud PAM4 digital mobile fronthaul is experimentally demonstrated to support 122 LTE-A channels with up to 4096QAM. Compared to PCM based CPRI, the supported number of channels increases 5 times and EVM is obviously improved.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2018
National Category
Communication Systems
Identifiers
urn:nbn:se:kth:diva-228555 (URN)10.1109/ECOC.2017.8346198 (DOI)000434969300372 ()2-s2.0-85046939372 (Scopus ID)9781538656242 (ISBN)
Conference
43rd European Conference on Optical Communication, ECOC 2017, Gothenburg, Sweden, 17 September 2017 through 21 September 2017
Funder
Swedish Foundation for Strategic Research Swedish Research CouncilGöran Gustafsson Foundation for Research in Natural Sciences and Medicine
Note

QC 20180528

Available from: 2018-05-28 Created: 2018-05-28 Last updated: 2018-08-28Bibliographically approved
Mardoyan, H., Jorge, F., Ozolins, O., Estaran, J. M., Udalcovs, A., Konczykowska, A., . . . Bigo, S. (2018). 204-GBaud On-Off Keying Transmitter for Inter-Data Center Communications. In: 2018 Optical Fiber Communications Conference and Exposition, OFC 2018 - Proceedings: . Paper presented at We demonstrate an on-off keyed transmitter with direct detection, at record symbol rates of 204Gbaud and 140Gbaud, over 10km and 80km, respectively, powered by a high-speed InP-based 2:1 selector and travelling-wave electro-absorption laser-modulator.. Institute of Electrical and Electronics Engineers (IEEE)
Open this publication in new window or tab >>204-GBaud On-Off Keying Transmitter for Inter-Data Center Communications
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2018 (English)In: 2018 Optical Fiber Communications Conference and Exposition, OFC 2018 - Proceedings, Institute of Electrical and Electronics Engineers (IEEE), 2018Conference paper, Published paper (Refereed)
Abstract [en]

We demonstrate an on-off keyed transmitter with direct detection, at record symbol rates of 204Gbaud and 140Gbaud, over 10km and 80km, respectively, powered by a high-speed InP-based 2: 1 selector and travelling-wave electro-absorption laser-modulator.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2018
National Category
Communication Systems
Identifiers
urn:nbn:se:kth:diva-232642 (URN)000437286300703 ()2-s2.0-85050011867 (Scopus ID)9781943580385 (ISBN)
Conference
We demonstrate an on-off keyed transmitter with direct detection, at record symbol rates of 204Gbaud and 140Gbaud, over 10km and 80km, respectively, powered by a high-speed InP-based 2:1 selector and travelling-wave electro-absorption laser-modulator.
Note

QC 20180803

Available from: 2018-08-02 Created: 2018-08-02 Last updated: 2019-08-20Bibliographically approved
Mardoyan, H., Jorge, F., Ozolins, O., Estaran, J. M., Udalcovs, A., Konczykowska, A., . . . Bigo, S. (2018). 204-GBaud On-OffKeying transmitter for inter-data center communications. In: Optics InfoBase Conference Papers: . Paper presented at Optical Fiber Communication Conference, OFC 2018, San Diego, United States, 11 March 2017 through 15 March 2017. Optics Info Base, Optical Society of America
Open this publication in new window or tab >>204-GBaud On-OffKeying transmitter for inter-data center communications
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2018 (English)In: Optics InfoBase Conference Papers, Optics Info Base, Optical Society of America, 2018Conference paper, Published paper (Refereed)
Abstract [en]

We demonstrate an on-offkeyed transmitter with direct detection, at record symbol rates of 204Gbaud and 140Gbaud, over 10km and 80km, respectively, powered by a high-speed InPbased 2:1 selector and travelling-wave electro-absorption laser-modulator.

Place, publisher, year, edition, pages
Optics Info Base, Optical Society of America, 2018
National Category
Communication Systems
Identifiers
urn:nbn:se:kth:diva-228663 (URN)10.1364/OFC.2018.Th4A.4 (DOI)2-s2.0-85047130701 (Scopus ID)9781557528209 (ISBN)
Conference
Optical Fiber Communication Conference, OFC 2018, San Diego, United States, 11 March 2017 through 15 March 2017
Note

QC 20180529

Available from: 2018-05-29 Created: 2018-05-29 Last updated: 2018-05-29Bibliographically approved
Ozolins, O., Pang, X., Udalcovs, A., Lin, R., Van Kerrebrouck, J., Gan, L., . . . Yin, X. (2018). 7×149 Gbit/s PAM4 transmission over 1 km multicore fiber for short-reach optical interconnects. In: Optics InfoBase Conference Papers: . Paper presented at CLEO: Science and Innovations, CLEO_SI 2018, 13 May 2018 through 18 May 2018. Optics Info Base, Optical Society of America
Open this publication in new window or tab >>7×149 Gbit/s PAM4 transmission over 1 km multicore fiber for short-reach optical interconnects
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2018 (English)In: Optics InfoBase Conference Papers, Optics Info Base, Optical Society of America, 2018Conference paper, Published paper (Refereed)
Abstract [en]

We transmit 80 Gbaud/λ/core PAM4 signal enabled by 1.55 μm EML over 1 km 7-core fiber. The solution achieves single-wavelength and single-fiber 1.04 Tbit/s post-FEC transmission enhancing bandwidth-density for short-reach optical interconnects.

Place, publisher, year, edition, pages
Optics Info Base, Optical Society of America, 2018
Keywords
Optical interconnects, Multicore fiber, Single fiber, Single wavelength, Pulse amplitude modulation
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-236408 (URN)10.1364/CLEO_SI.2018.SM4C.4 (DOI)2-s2.0-85048973061 (Scopus ID)9781557528209 (ISBN)
Conference
CLEO: Science and Innovations, CLEO_SI 2018, 13 May 2018 through 18 May 2018
Note

QC 20181031

Available from: 2018-10-31 Created: 2018-10-31 Last updated: 2018-10-31Bibliographically approved
Zhang, L., Ozolins, O., Lin, R., Udalcovs, A., Pang, X., Gan, L., . . . Chen, J. (2018). Kernel Adaptive Filtering for Nonlinearity-Tolerant Optical Direct Detection Systems. In: European Conference on Optical Communication, ECOC: . Paper presented at 2018 European Conference on Optical Communication, ECOC 2018, 23 September 2018 through 27 September 2018. Institute of Electrical and Electronics Engineers Inc.
Open this publication in new window or tab >>Kernel Adaptive Filtering for Nonlinearity-Tolerant Optical Direct Detection Systems
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2018 (English)In: European Conference on Optical Communication, ECOC, Institute of Electrical and Electronics Engineers Inc. , 2018Conference paper, Published paper (Refereed)
Abstract [en]

Kernel adaptive filtering (KAF) is proposed for nonlinearity-tolerant optical direct detection. for 7× 128 Gbit/s PAM4 transmission over 33.6km 7-core-fiber, KAF only needs 10 equalizer taps to reach KP4-FEC limit (BER@2.2e-4), whereas decision-feedback-equalizer needs 43 equalizer taps to reach HD-FEC limit (BER@3.8e-3).

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers Inc., 2018
Keywords
Adaptive filters, Decision feedback equalizers, Digital television, Optical communication, Direct detection, Kernel adaptive filtering, Optical direct-detection system, Adaptive filtering
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-252252 (URN)10.1109/ECOC.2018.8535560 (DOI)2-s2.0-85063212979 (Scopus ID)9781538648629 (ISBN)
Conference
2018 European Conference on Optical Communication, ECOC 2018, 23 September 2018 through 27 September 2018
Note

QC20190816

Available from: 2019-08-16 Created: 2019-08-16 Last updated: 2019-08-16Bibliographically approved
Lin, R., Pang, X., Van Kerrebrouck, J., Verplaetse, M., Ozolins, O., Udalcovs, A., . . . Chen, J. (2018). Real-time 100 Gbps/lambda/core NRZ and EDB IM/DD Transmission over 10 km Multicore Fiber. In: 2018 Optical Fiber Communications Conference and Exposition, OFC 2018 - Proceedings: . Paper presented at 2018 Optical Fiber Communications Conference and Exposition, OFC 2018, San Diego, United States, 11 March 2018 through 15 March 2018. Institute of Electrical and Electronics Engineers (IEEE)
Open this publication in new window or tab >>Real-time 100 Gbps/lambda/core NRZ and EDB IM/DD Transmission over 10 km Multicore Fiber
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2018 (English)In: 2018 Optical Fiber Communications Conference and Exposition, OFC 2018 - Proceedings, Institute of Electrical and Electronics Engineers (IEEE), 2018Conference paper, Published paper (Refereed)
Abstract [en]

A BiCMOS chip-based real-time IM/DD spatial division multiplexing system is experimentally demonstrated for short-reach communications. 100 Gbps/./core NRZ and EDB transmission is achieved below 7%-overhead HD-FEC limit after 10km 7-core fiber with optical dispersion compensation.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2018
National Category
Communication Systems
Identifiers
urn:nbn:se:kth:diva-232641 (URN)000437286300418 ()2-s2.0-85045556692 (Scopus ID)9781943580385 (ISBN)
Conference
2018 Optical Fiber Communications Conference and Exposition, OFC 2018, San Diego, United States, 11 March 2018 through 15 March 2018
Funder
Swedish Research CouncilSwedish Foundation for Strategic Research
Note

QC 20180802

Available from: 2018-08-02 Created: 2018-08-02 Last updated: 2019-08-20Bibliographically approved
Lin, R., Pang, X., Van Kerrebrouck, J., Verplaetse, M., Ozolins, O., Udalcovs, A., . . . Chen, J. (2018). Real-time 100 Gbps/λ/core NRZ and EDB IM/DD transmission over 10 km multicore fiber. In: Optics InfoBase Conference Papers: . Paper presented at Optical Fiber Communication Conference, OFC 2018, 11 March 2017 through 15 March 2017. Optical Society of America
Open this publication in new window or tab >>Real-time 100 Gbps/λ/core NRZ and EDB IM/DD transmission over 10 km multicore fiber
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2018 (English)In: Optics InfoBase Conference Papers, Optical Society of America, 2018Conference paper, Published paper (Refereed)
Abstract [en]

A BiCMOS chip-based real-time IM/DD spatial division multiplexing system is experimentally demonstrated for short-reach communications. 100 Gbps/λ/core NRZ and EDB transmission is achieved below 7%-overhead HD-FEC limit after 10km 7-core fiber with optical dispersion compensation.

Place, publisher, year, edition, pages
Optical Society of America, 2018
Keywords
Digital television, Multiplexing equipment, Optical fibers, Bi-CMOS, Chip based, Multicore fiber, Optical dispersion compensation, Real time, Spatial Division Multiplexing, Optical fiber communication
National Category
Computer Engineering
Identifiers
urn:nbn:se:kth:diva-236362 (URN)10.1364/OFC.2018.W2A.19 (DOI)2-s2.0-85047130812 (Scopus ID)9781557528209 (ISBN)
Conference
Optical Fiber Communication Conference, OFC 2018, 11 March 2017 through 15 March 2017
Note

QC 20181106

Available from: 2018-11-06 Created: 2018-11-06 Last updated: 2018-11-06Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-7056-4379

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